Two vulnerabilities, a security issue, and a weakness have been reported in the Linux Kernel, which can be exploited by malicious, local users to cause a DoS (Denial of Service) and by malicious people to cause a DoS.
1) An error in handling asynchronous USB access via usbdevio can be exploited to crash the kernel via a process that issues an URB (USB Request Block) from userspace and terminates before the URB returns.
Successful exploitation requires that the user has permissions to access an USB device.
2) An error in jiffies comparison in the "ipt_recent.c" netfilter module, when its value is greater than LONG_MAX, may cause ipt_recent netfilter rules to block too early.
3) An error in the IPv6 flowlabel handling code in "/net/ipv6/ip6_flowlabel.c" can be exploited by a local users to cause the kernel to free non-allocated memory. This corrupts kernel memory and can cause the system to crash.
4) The ICMP implementation responds to broadcast ECHO/TIMESTAMP requests by default. This can potentially be exploited to cause a DoS via a smurf attack.
Solution: Vulnerability #1, #3 and #4 have been fixed in version 2.6.14.
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Subject: Linux Kernel URB and IPv6 Flowlabel Handling Denial of Service
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